GFB Internal Wastegate Actuator for Subaru WRX STI 1999-2021 3 Series (E46) Durable construction and designed for

Durable construction and designed for daily use

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GFB Internal Wastegate Actuator for Subaru WRX STI 1999-2021 3 Series (E46) Durable construction and designed fordesigned to improve boost control Suits WRX STI 1999 2021 The WGA is a high performance bolt on internal wastegate actuator designed to bring boost on sooner and hold it longer! The WGA is all about increasing the area under the boost curve. With a larger diaphragm than the OEM actuator, the WGA has more control authority over the wastegate flap. This makes it harder for exhaust backpressure to blow the wastegate open during spool up and at high RPM,